Minimize Baseline

In Image Mode, the SAR obtained strips of high-resolution imagery, 100 km in width, to the right of the satellite track. AMI could only operate in one mode at a time. Therefore, operating in Image Mode prevented the operation of the other AMI modes. Power considerations limited the SAR operating time to a maximum of about 12 minutes per orbit. The data rate of 105 Mbit/s was too high to allow on-board storage, and so images were only acquired if the satellite was within range of receiving ground stations.

In Wave Mode, the SAR measured the ocean radar reflectivity over 5 km by 5 km imagettes at intervals of 200 km along track. The imagettes were used to provide ocean spectra, which gave information about the wavelength and direction of ocean wave systems.

More information on the Image and Wave modes is provided below:

  • C-band frequency: 5.30 GHz (equivalent to 5.66 cm wavelength)
  • Bandwidth: 15.55 MHz
  • Polarisation: transmit V, receive V
  • Spatial resolution: ~30 m.

 

Minimize ERS-2 Attitude Control Modes and Orbit Dead-band control

The piloting of the ERS-2 satellite was initially performed using three gyroscopes (out of six available), with the number of functioning gyroscopes reducing during the mission lifetime due to failures.  SAR products have been used to monitor the Doppler centroid frequency of imagery acquired by ERS-2 as shown in the figure below.

It can be seen that there were several occasions during the early years of the ERS-2 mission, there was a larger than expected change in Doppler centroid frequency. This was due, primarily, to imagery acquired during orbit manoeuvres (imagery acquired during a manoeuvre can still be processed but it may be unsuitable for interferometry). The negative Doppler Centroid frequencies are from ascending pass imagery while positive values are from descending pass imagery. Each product header contains the Doppler information for the product.

Due to the continuing gyroscope failures, a mono-gyro (1GP) piloting mode began operation on 11 February 2000. A consequence of this change was a loss of attitude stability but the impact on SAR product quality was small.  For the 1GP mode the Doppler Centroid frequency increased for localised areas and time intervals but values were mostly limited to the first ambiguity number (-1600Hz to 1600Hz).  During this IGP period, new on-board software to pilot the satellite without using any gyroscopes by exploiting the capabilities of the Digital Earth Sensor and Digital Sun Sensor was developed and tested. A first coarse version of this software, the Extra Backup mode (EBM) was uploaded to ERS-2 in December 2000 as a first step for gyro-less operations and was operationally used since mid-January 2001 due to further problems with the remaining gyroscopes.  Significant degradation of the ERS-2 attitude (particularly for yaw) occurred during the EBM. Very large Doppler Centroid frequencies are difficult to estimate in SAR processor – particularly for values outside ±4500Hz with the ESA SAR processors.

Improvements in attitude control took place in June 2001 with the introduction of the Zero Gyro Mode (ZGM) and again in March 2002 with ZGM-Yaw Control Monitoring (ZGM-YCM) – 90% of the Doppler Centroid frequencies remained within ±4500Hz.  A further refinement involved deriving yaw values in real-time from wave-mode data to automatically correct the instrument attitude during the next orbit pass if necessary. Some changes to the strategy were required after the failure of the on-board tape recorder in June 2003, since wave mode acquisitions all around the orbit could not be used anymore. Using a network of receiving ground stations, it was possible to continue receiving wave-mode data although coverage was reduced to the northern hemisphere.  This strategy was called Regional YCM (R-YCM).

Subset of ERS-2 Doppler Centroid Frequency over the mission lifetime. The start of Zero Gyro Mode operation in 2001 is clearly visible.

 

Doppler Centroid Information is available in the links below for the different ERS-2 modes:

ERS-2 3 Gyro Mode (until 02/2000)

ERS-2 Mono-Gyro Mode (from 02/2000 to 01/2001)

ERS-2 EBM Mode (from 01/2001 to 06/2001)

ERS-2 Zero-Gyro Mode (from 06/2001)

 

A full description of gyro operational status and impact is provided in a paper here. This paper also gives more details of the changes in the interferometric dead-band indicated below due to the impact of gyroscope failures. 

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Minimize Instrument Calibration - Replica pulse power correction factor

A small number of products generated within the ESA ground segment (< 1%) are processed with a nominal replica pulse rather than a replica generated at the time of imaging (an extracted replica).  This occurs when the extracted replica pulse is corrupt. Products generated with a nominal replica have significantly higher pixel values than products generated using an extracted replica.  These products can be corrected.  For ERS-2 SAR products, the correction depends on the extracted replica pulse power at the time of data acquisition.  This can be estimated from the quarterly averaged values given in the table below.  For 2003 Q1, two corrections are given, one before 26th February and the other after 28th February due to the gain change between these dates (increase of the Image up-converter level by 2.5dB on 26 February 2003 and increase of the image receiver attenuation gain by 1dB on 28 February 2003).  Replica pulse powers between 4th September 10:04:14 and 14th October 2004 14:37:11 UTC have been increased by 4dB to correct for the erroneous calibration attenuation gain setting during this period. The correction factor is applied such that the image intensity values need to be reduced.  Note that as the correction given in the table has been derived from replica pulses from the start of imaging sequences, no account is made for any variations in replica power between the start and end of imaging sequences.

For more details please see the technical note ERS calibration Derivation of the backscattering coefficient sigma nought in ESA ERS SAR PRI products.

Year Q1 Q2 Q3 Q4
1995     23.57 23.38
1996 23.23 23.15 23.05 22.78
1997 22.61 22.43 22.29 22.11
1998 21.97 21.81 21.57 21.42
1999 21.29 21.15 20.98 20.78
2000 20.60 20.47 20.44 20.21
2001 20.02 19.90 19.67 19.40
2002 19.19 19.21 18.90 18.63
2003 18.44, 21.52 21.49 21.33 21.10
2004 20.90 20.98 20.90 20.66
2005 20.40 20.35 20.21 19.89
2006 19.63 19.52 19.42 19.21
2007 19.02 18.98 18.82 18.64
2008 18.59 18.48 18.36 18.18
2009 18.11 17.96 17.82 17.63
2010 17.50 17.36 17.29 17.13
2011 16.93 16.88    
Quarterly averaged nominal replica pulse correction for the ERS-2 SAR (dB)

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Minimize ERS-2 3 Gyro Mode (until 02/2000)

Graphical Doppler data evolution:

 

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Minimize ERS-2 Mono-Gyro Mode (from 02/2000 to 01/2001)

Graphical Doppler data evolution:

 

Or download Doppler data for this period

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Minimize ERS-2 EBM Mode (from 01/2001 to 06/2001)

Hight rate Doppler available at ESRIN for EBM:

 

SCENE DATE DOPPLER (near range)
ORBIT=29861-FRAME=2871 2001-01-05 04:37:15 75.2390
ORBIT=30418-FRAME=6939 2001-02-13 03:27:34 -1982.3840
ORBIT=30418-FRAME=6939 2001-02-13 03:27:34 -1982.3840
ORBIT=30418-FRAME=6975 2001-02-13 03:28:04 -1849.3560
ORBIT=30418-FRAME=6975 2001-02-13 03:28:04 -1849.3970
ORBIT=30418-FRAME=6975 2001-02-13 03:28:04 -1849.3560
ORBIT=30418-FRAME=6975 2001-02-13 03:28:04 -1849.3970
ORBIT=30418-FRAME=6993 2001-02-13 03:28:19 -1823.4720
ORBIT=30418-FRAME=6993 2001-02-13 03:28:19 -1823.4720
ORBIT=30418-FRAME=7011 2001-02-13 03:28:34 -1811.5840
ORBIT=30418-FRAME=7011 2001-02-13 03:28:34 -1811.5840
ORBIT=30451-FRAME=2763 2001-02-15 09:48:59 -6709.8850
ORBIT=30451-FRAME=2781 2001-02-15 09:49:14 -6515.0990
ORBIT=30473-FRAME=0801 2001-02-16 22:14:50 314.3640
ORBIT=30473-FRAME=0819 2001-02-16 22:15:05 299.6750
ORBIT=30494-FRAME=2745 2001-02-18 09:54:36 -347.5760
ORBIT=30494-FRAME=2763 2001-02-18 09:54:51 -140.3070
ORBIT=30795-FRAME=2482 2001-03-11 10:31:17 -6413.5850
ORBIT=30827-FRAME=3321 2001-03-13 16:22:12 -1354.5490
ORBIT=30827-FRAME=3339 2001-03-13 16:22:27 -1057.0220
ORBIT=30838-FRAME=2529 2001-03-14 10:37:41 -5954.8940
ORBIT=30838-FRAME=2547 2001-03-14 10:37:56 -5914.6460
ORBIT=30873-FRAME=1053 2001-03-16 20:58:02 -2363.0230
ORBIT=30874-FRAME=0567 2001-03-16 22:31:53 1507.1440
ORBIT=30874-FRAME=0837 2001-03-16 22:35:39 2299.9110
ORBIT=30874-FRAME=1053 2001-03-16 22:38:41 2423.7430
ORBIT=30874-FRAME=1467 2001-03-16 22:44:27 1953.3760
ORBIT=30881-FRAME=2331 2001-03-17 10:40:39 -4713.0450
ORBIT=30881-FRAME=2583 2001-03-17 10:44:11 -3706.1400
ORBIT=30881-FRAME=2979 2001-03-17 10:49:44 -1552.2860
ORBIT=30887-FRAME=0819 2001-03-17 20:23:09 -1396.1890
ORBIT=30887-FRAME=1053 2001-03-17 20:26:25 -1486.8310
ORBIT=30895-FRAME=2295 2001-03-18 10:08:31 -5369.1810
ORBIT=30895-FRAME=2547 2001-03-18 10:12:03 -4385.6900
ORBIT=30895-FRAME=3015 2001-03-18 10:18:37 -1742.9470
ORBIT=30902-FRAME=0567 2001-03-18 21:28:41 7089.6590
ORBIT=30931-FRAME=1539 2001-03-20 22:19:32 -340.5980
ORBIT=30945-FRAME=1611 2001-03-21 21:48:55 -851.7220
ORBIT=30974-FRAME=0621 2001-03-23 22:12:27 3722.8800
ORBIT=30974-FRAME=0801 2001-03-23 22:14:58 4337.4890
ORBIT=30974-FRAME=1053 2001-03-23 22:18:30 4171.7030
ORBIT=30974-FRAME=1521 2001-03-23 22:25:02 3705.6010
ORBIT=30980-FRAME=2547 2001-03-24 08:42:53 -2521.0040
ORBIT=30980-FRAME=2799 2001-03-24 08:46:25 -820.0330
ORBIT=30980-FRAME=3015 2001-03-24 08:49:28 875.4810
ORBIT=30988-FRAME=0567 2001-03-24 21:40:03 2741.7980
ORBIT=30988-FRAME=0873 2001-03-24 21:44:20 3100.8600
ORBIT=30988-FRAME=1035 2001-03-24 21:46:36 2814.3300
ORBIT=30988-FRAME=1593 2001-03-24 21:54:23 1132.6480
ORBIT=30995-FRAME=2547 2001-03-25 09:51:51 -1661.1930
ORBIT=30995-FRAME=2763 2001-03-25 09:54:53 -816.7810
ORBIT=30995-FRAME=3015 2001-03-25 09:58:25 686.3260
ORBIT=31002-FRAME=0567 2001-03-25 21:08:22 -2001.4850
ORBIT=31002-FRAME=0801 2001-03-25 21:11:39 -692.8330
ORBIT=31002-FRAME=1053 2001-03-25 21:15:11 89.5240
ORBIT=31002-FRAME=1629 2001-03-25 21:23:16 2251.4230
ORBIT=31010-FRAME=2007 2001-03-26 10:53:16 -3553.3260
ORBIT=31010-FRAME=2547 2001-03-26 11:00:48 -3450.8290
ORBIT=31010-FRAME=2799 2001-03-26 11:04:20 -2572.1220
ORBIT=31010-FRAME=3015 2001-03-26 11:07:22 -1226.8700
ORBIT=31053-FRAME=2835 2001-03-29 11:10:32 322.0590
ORBIT=31053-FRAME=2853 2001-03-29 11:10:47 412.7730
ORBIT=31067-FRAME=2547 2001-03-30 10:34:50 -3085.2250
ORBIT=31067-FRAME=2673 2001-03-30 10:36:36 -1991.2480
ORBIT=31067-FRAME=2691 2001-03-30 10:36:51 -1780.4310
ORBIT=31074-FRAME=0909 2001-03-30 21:56:09 247.9160
ORBIT=31074-FRAME=0927 2001-03-30 21:56:24 198.0400
ORBIT=31102-FRAME=2277 2001-04-01 21:11:58 2318.6520
ORBIT=31102-FRAME=2295 2001-04-01 21:12:13 2453.1370
ORBIT=31104-FRAME=6777 2001-04-02 01:36:03 4063.9780
ORBIT=31104-FRAME=6795 2001-04-02 01:36:18 4001.9910
ORBIT=31115-FRAME=2615 2001-04-02 19:04:23 -744.8260
ORBIT=31139-FRAME=3051 2001-04-04 11:24:46 1330.8180
ORBIT=31139-FRAME=3069 2001-04-04 11:25:01 1501.1400
ORBIT=31144-FRAME=7155 2001-04-04 20:45:02 -4804.4940
ORBIT=31144-FRAME=7173 2001-04-04 20:45:17 -4658.6600
ORBIT=31154-FRAME=2277 2001-04-05 12:22:52 -1707.5140
ORBIT=31154-FRAME=2295 2001-04-05 12:23:07 -1759.2880
ORBIT=31167-FRAME=2493 2001-04-06 10:13:40 -980.0460
ORBIT=31167-FRAME=2511 2001-04-06 10:13:55 -907.9170
ORBIT=31181-FRAME=2763 2001-04-07 09:45:54 6489.7500
ORBIT=31181-FRAME=2781 2001-04-07 09:46:10 6619.3750
ORBIT=31188-FRAME=1071 2001-04-07 21:06:26 1645.3490
ORBIT=31188-FRAME=1089 2001-04-07 21:06:41 1610.2920
ORBIT=31224-FRAME=2763 2001-04-10 09:51:38 -3912.8910
ORBIT=31238-FRAME=2205 2001-04-11 09:12:17 1893.1670
ORBIT=31238-FRAME=2817 2001-04-11 09:20:52 4353.3490
ORBIT=31253-FRAME=2385 2001-04-12 10:23:47 -655.2570
ORBIT=31253-FRAME=2871 2001-04-12 10:30:37 3273.8610
ORBIT=31254-FRAME=1935 2001-04-12 11:58:03 -6155.2120
ORBIT=31260-FRAME=0729 2001-04-12 21:44:51 303.8980
ORBIT=31260-FRAME=1017 2001-04-12 21:48:53 339.1180
ORBIT=31260-FRAME=1575 2001-04-12 21:56:40 488.4700
ORBIT=31260-FRAME=2529 2001-04-12 22:10:02 3586.1500
ORBIT=31268-FRAME=1971 2001-04-13 11:26:58 -4796.3580
ORBIT=31268-FRAME=2529 2001-04-13 11:34:46 -2273.1420
ORBIT=31268-FRAME=3051 2001-04-13 11:42:07 1694.7610
ORBIT=31274-FRAME=0603 2001-04-13 21:11:29 -888.1690
ORBIT=31274-FRAME=1251 2001-04-13 21:20:32 -689.0890
ORBIT=31282-FRAME=2871 2001-04-14 11:07:56 -3716.0000
ORBIT=31282-FRAME=3447 2001-04-14 11:16:02 978.7290
ORBIT=31288-FRAME=0621 2001-04-14 20:40:06 -3351.0940
ORBIT=31288-FRAME=1323 2001-04-14 20:49:55 -3035.2920
ORBIT=31296-FRAME=2223 2001-04-15 10:27:16 -5875.9930
ORBIT=31296-FRAME=2871 2001-04-15 10:36:20 -3358.5480
ORBIT=31302-FRAME=0495 2001-04-15 20:06:43 -5744.2310
ORBIT=31302-FRAME=1395 2001-04-15 20:19:18 -4871.9430
ORBIT=31306-FRAME=6057 2001-04-16 04:06:55 3358.1710
ORBIT=31310-FRAME=1953 2001-04-16 09:51:53 -5838.0520
ORBIT=31310-FRAME=2853 2001-04-16 10:04:30 -1184.9780
ORBIT=31325-FRAME=2853 2001-04-17 11:13:28 -4420.3150
ORBIT=31325-FRAME=3411 2001-04-17 11:21:18 -56.1900
ORBIT=31330-FRAME=1629 2001-04-17 19:19:21 -7121.8210
ORBIT=31332-FRAME=0693 2001-04-17 22:27:30 -1873.0380
ORBIT=31339-FRAME=2547 2001-04-18 10:37:36 -2246.6310
ORBIT=31339-FRAME=2889 2001-04-18 10:42:24 -6.1070
ORBIT=31346-FRAME=0729 2001-04-18 21:56:25 488.3080
ORBIT=31346-FRAME=1557 2001-04-18 22:08:00 1308.5760
ORBIT=31353-FRAME=2169 2001-04-19 10:00:41 -5809.4250
ORBIT=31353-FRAME=2781 2001-04-19 10:09:16 -2996.8150
ORBIT=31360-FRAME=0639 2001-04-19 21:23:32 -2622.4910
ORBIT=31360-FRAME=1215 2001-04-19 21:31:35 -2038.8130
ORBIT=31362-FRAME=6687 2001-04-20 02:09:15 -946.5780
ORBIT=31368-FRAME=2835 2001-04-20 11:19:00 -3933.3350
ORBIT=31368-FRAME=3375 2001-04-20 11:26:35 488.5540
ORBIT=31374-FRAME=0657 2001-04-20 20:52:10 -3494.2320
ORBIT=31374-FRAME=1287 2001-04-20 21:00:58 -3679.1640
ORBIT=31382-FRAME=2853 2001-04-21 10:47:39 -3376.0050
ORBIT=31388-FRAME=0621 2001-04-21 20:20:04 -1173.8540
ORBIT=31388-FRAME=1377 2001-04-21 20:30:38 -1245.3940
ORBIT=31396-FRAME=2727 2001-04-22 10:14:17 -1814.5710
ORBIT=31397-FRAME=1989 2001-04-22 11:44:33 -4587.7240
ORBIT=31410-FRAME=2169 2001-04-23 09:34:51 -4226.0660
ORBIT=31410-FRAME=2871 2001-04-23 09:44:42 90.5640
ORBIT=31418-FRAME=0711 2001-04-23 22:39:19 746.7220
ORBIT=31418-FRAME=1323 2001-04-23 22:47:53 1851.7340
ORBIT=31425-FRAME=3483 2001-04-24 11:02:16 2496.5960
ORBIT=31427-FRAME=3645 2001-04-24 14:25:43 1710.0480
ORBIT=31427-FRAME=3645 2001-04-24 14:25:43 1710.0480
ORBIT=31427-FRAME=3663 2001-04-24 14:25:58 1886.6010
ORBIT=31427-FRAME=3663 2001-04-24 14:25:58 1886.6010
ORBIT=31432-FRAME=0819 2001-04-24 22:09:12 -164.4580
ORBIT=31432-FRAME=1539 2001-04-24 22:19:16 293.9920
ORBIT=31439-FRAME=2727 2001-04-25 10:20:02 -2627.4350
ORBIT=31446-FRAME=0567 2001-04-25 21:34:03 -2221.8480
ORBIT=31446-FRAME=0819 2001-04-25 21:37:35 -1413.8030
ORBIT=31446-FRAME=1053 2001-04-25 21:40:51 -1245.0770
ORBIT=31446-FRAME=1611 2001-04-25 21:48:39 -442.3350
ORBIT=31454-FRAME=2007 2001-04-26 11:18:56 -5274.3690
ORBIT=31454-FRAME=3303 2001-04-26 11:37:05 -1195.5360
ORBIT=31460-FRAME=0783 2001-04-26 21:05:29 620.9670
ORBIT=31460-FRAME=1629 2001-04-26 21:17:18 132.9660
ORBIT=31467-FRAME=2205 2001-04-27 09:09:31 -1878.7390
ORBIT=31467-FRAME=2835 2001-04-27 09:18:21 1216.2120
ORBIT=31474-FRAME=0621 2001-04-27 20:31:33 -5190.7860
ORBIT=31474-FRAME=1341 2001-04-27 20:41:37 -4427.7110
ORBIT=31474-FRAME=6489 2001-04-27 21:53:34 -858.0060
ORBIT=31474-FRAME=6489 2001-04-27 21:53:34 -858.0060
ORBIT=31474-FRAME=6489 2001-04-27 21:53:34 -857.0730
ORBIT=31474-FRAME=6507 2001-04-27 21:53:49 -874.3080
ORBIT=31481-FRAME=2547 2001-04-28 08:42:41 -911.2890
ORBIT=31481-FRAME=2781 2001-04-28 08:45:58 1076.2600
ORBIT=31488-FRAME=1215 2001-04-28 20:08:16 -1151.0310
ORBIT=31496-FRAME=2547 2001-04-29 09:51:40 -989.5800
ORBIT=31496-FRAME=2763 2001-04-29 09:54:41 118.8210
ORBIT=31504-FRAME=0747 2001-04-29 22:51:18 -281.2010
ORBIT=31504-FRAME=1323 2001-04-29 22:59:22 214.1780
ORBIT=31511-FRAME=2007 2001-04-30 10:53:04 -4525.2630
ORBIT=31511-FRAME=2547 2001-04-30 11:00:37 -2680.7830
ORBIT=31511-FRAME=3447 2001-04-30 11:13:15 3389.8310
ORBIT=31514-FRAME=3292 2001-04-30 16:12:50 -753.9390
ORBIT=31514-FRAME=3292 2001-04-30 16:12:51 -753.9550
ORBIT=31518-FRAME=0801 2001-04-30 22:20:27 1375.6210
ORBIT=31518-FRAME=1143 2001-04-30 22:25:14 1783.6300
ORBIT=31525-FRAME=2205 2001-05-01 10:24:12 -5703.9430
ORBIT=31525-FRAME=2817 2001-05-01 10:32:47 -2209.4170
ORBIT=31532-FRAME=0855 2001-05-01 21:49:33 -1628.4710
ORBIT=31532-FRAME=1431 2001-05-01 21:57:36 -1799.4670
ORBIT=31539-FRAME=2169 2001-05-02 09:52:05 -4024.1290
ORBIT=31539-FRAME=2745 2001-05-02 10:00:09 -733.7990
ORBIT=31546-FRAME=0819 2001-05-02 21:17:25 -3881.0680
ORBIT=31546-FRAME=1251 2001-05-02 21:23:27 -3573.3660
ORBIT=31554-FRAME=2835 2001-05-03 11:10:22 -2394.2880
ORBIT=31554-FRAME=2853 2001-05-03 11:10:38 -2249.6140
ORBIT=31568-FRAME=2547 2001-05-04 10:34:43 -2940.2500
ORBIT=31568-FRAME=2673 2001-05-04 10:36:29 -2267.7970
ORBIT=31568-FRAME=2691 2001-05-04 10:36:44 -2143.5480
ORBIT=31582-FRAME=2385 2001-05-05 10:00:49 -4186.7350
ORBIT=31582-FRAME=2403 2001-05-05 10:01:04 -4153.8320
ORBIT=31603-FRAME=2277 2001-05-06 21:11:57 4853.4460
ORBIT=31603-FRAME=2277 2001-05-06 21:11:57 4853.4460
ORBIT=31603-FRAME=2295 2001-05-06 21:12:12 4937.6440
ORBIT=31603-FRAME=2295 2001-05-06 21:12:12 4937.6440
ORBIT=31632-FRAME=0621 2001-05-08 21:26:05 -1643.7000
ORBIT=31632-FRAME=0639 2001-05-08 21:26:20 -1602.5110
ORBIT=31640-FRAME=3069 2001-05-09 11:25:04 -1166.3190
ORBIT=31645-FRAME=7155 2001-05-09 20:45:07 -4042.0160
ORBIT=31645-FRAME=7155 2001-05-09 20:45:07 -4042.0160
ORBIT=31654-FRAME=2439 2001-05-10 10:44:36 -4808.0040
ORBIT=31654-FRAME=2475 2001-05-10 10:45:07 -4618.5780
ORBIT=31654-FRAME=2493 2001-05-10 10:45:22 -4577.4140
ORBIT=31668-FRAME=2493 2001-05-11 10:13:44 -2897.2300
ORBIT=31668-FRAME=2511 2001-05-11 10:14:00 -2824.7500
ORBIT=31671-FRAME=3375 2001-05-11 15:27:52 -797.1620
ORBIT=31671-FRAME=3393 2001-05-11 15:28:07 -535.2640
ORBIT=31671-FRAME=3411 2001-05-11 15:28:23 -353.2060
ORBIT=31682-FRAME=2763 2001-05-12 09:45:53 -2319.0630
ORBIT=31682-FRAME=2781 2001-05-12 09:46:08 -2212.4640
ORBIT=31697-FRAME=2673 2001-05-13 10:53:34 -4666.8690
ORBIT=31697-FRAME=2691 2001-05-13 10:53:49 -4542.6980
ORBIT=31704-FRAME=0909 2001-05-13 22:13:09 511.3030
ORBIT=31704-FRAME=0927 2001-05-13 22:13:24 501.0860
ORBIT=31711-FRAME=2547 2001-05-14 10:20:10 -4322.0620
ORBIT=31711-FRAME=2565 2001-05-14 10:20:26 -4216.0110
ORBIT=31717-FRAME=0297 2001-05-14 19:52:19 -5050.4370
ORBIT=31718-FRAME=1035 2001-05-14 21:43:15 -2440.0830
ORBIT=31718-FRAME=1053 2001-05-14 21:43:30 -2469.3360
ORBIT=31725-FRAME=2745 2001-05-15 09:51:19 -2227.1760
ORBIT=31725-FRAME=2763 2001-05-15 09:51:34 -2163.4760
ORBIT=31732-FRAME=1251 2001-05-15 21:14:37 -2445.2230
ORBIT=31732-FRAME=1269 2001-05-15 21:14:53 -2337.3590
ORBIT=31739-FRAME=2205 2001-05-16 09:12:07 -4619.0110
ORBIT=31739-FRAME=2817 2001-05-16 09:20:41 -2594.3080
ORBIT=31754-FRAME=2385 2001-05-17 10:23:35 -4364.9720
ORBIT=31754-FRAME=2871 2001-05-17 10:30:24 -2310.3890
ORBIT=31761-FRAME=2529 2001-05-17 22:09:51 3072.9970
ORBIT=31761-FRAME=2529 2001-05-17 22:09:51 3072.9970
ORBIT=31769-FRAME=3051 2001-05-18 11:41:53 -2767.3360
ORBIT=31783-FRAME=2871 2001-05-19 11:07:45 -2498.0820
ORBIT=31783-FRAME=3447 2001-05-19 11:15:51 1960.6900
ORBIT=31797-FRAME=2223 2001-05-20 10:27:04 -5565.2070
ORBIT=31797-FRAME=2871 2001-05-20 10:36:09 -2587.2180
ORBIT=31811-FRAME=1953 2001-05-21 09:51:41 -4737.4550
ORBIT=31811-FRAME=2853 2001-05-21 10:04:17 -1658.3420
ORBIT=31869-FRAME=1989 2001-05-25 11:06:56 -6142.9910
ORBIT=31883-FRAME=1989 2001-05-26 10:35:18 -5716.6570
ORBIT=31883-FRAME=2853 2001-05-26 10:47:24 -2379.9390
ORBIT=31911-FRAME=2169 2001-05-28 09:34:35 -4355.4360
ORBIT=31911-FRAME=2871 2001-05-28 09:44:25 -1311.3760
ORBIT=31926-FRAME=2907 2001-05-29 10:53:53 -1745.4890
ORBIT=31940-FRAME=2187 2001-05-30 10:12:11 -4747.5240
ORBIT=31954-FRAME=2781 2001-05-31 09:48:53 -1423.7780
ORBIT=31955-FRAME=3303 2001-05-31 11:36:47 87.1040
ORBIT=31968-FRAME=2205 2001-06-01 09:09:11 -4569.6790
ORBIT=31968-FRAME=2835 2001-06-01 09:18:00 -1398.7520
ORBIT=31969-FRAME=2799 2001-06-01 10:58:06 -2637.9360
ORBIT=31982-FRAME=2547 2001-06-02 08:42:22 -971.7610
ORBIT=31982-FRAME=2781 2001-06-02 08:45:39 493.6190
ORBIT=31997-FRAME=2547 2001-06-03 09:51:18 -4012.7570
ORBIT=31997-FRAME=2763 2001-06-03 09:54:20 -3191.9460
ORBIT=32012-FRAME=2007 2001-06-04 10:52:43 -5801.1290
ORBIT=32012-FRAME=2547 2001-06-04 11:00:16 -3847.6530
ORBIT=32012-FRAME=3447 2001-06-04 11:12:55 2098.5750
ORBIT=32026-FRAME=2205 2001-06-05 10:23:51 -5474.0790
ORBIT=32026-FRAME=2817 2001-06-05 10:32:25 -2922.7430
ORBIT=32040-FRAME=2169 2001-06-06 09:51:44 -3794.5550
ORBIT=32040-FRAME=2745 2001-06-06 09:59:48 -1877.6970
ORBIT=32046-FRAME=0891 2001-06-06 19:37:27 -4949.4130
ORBIT=32055-FRAME=2835 2001-06-07 11:09:59 -5696.8390
ORBIT=32110-FRAME=3771 2001-06-11 07:35:59 989.3550
ORBIT=32110-FRAME=3771 2001-06-11 07:35:59 989.3550
ORBIT=32110-FRAME=3789 2001-06-11 07:36:14 900.2720
ORBIT=32110-FRAME=3789 2001-06-11 07:36:14 900.2720
ORBIT=32119-FRAME=0729 2001-06-11 21:58:51 -1416.0240
ORBIT=32119-FRAME=0855 2001-06-11 22:00:36 -740.5070
ORBIT=32119-FRAME=1089 2001-06-11 22:03:53 200.4930
ORBIT=32155-FRAME=2403 2001-06-14 10:43:52 5216.7450
ORBIT=32156-FRAME=2277 2001-06-14 12:22:43 5755.9970
ORBIT=32156-FRAME=2295 2001-06-14 12:22:58 5849.3010
ORBIT=32169-FRAME=2493 2001-06-15 10:13:31 5674.9530
ORBIT=32169-FRAME=2511 2001-06-15 10:13:46 5706.1920
ORBIT=32183-FRAME=2763 2001-06-16 09:45:41 5994.8850
ORBIT=32183-FRAME=2781 2001-06-16 09:45:56 5965.5640
ORBIT=32198-FRAME=2385 2001-06-17 10:49:23 6289.3180
ORBIT=32248-FRAME=0765 2001-06-20 22:16:41 6862.2190
ORBIT=32264-FRAME=6561 2001-06-22 02:27:10 1344.1520
ORBIT=32264-FRAME=6561 2001-06-22 02:27:10 1344.1520
ORBIT=32276-FRAME=0603 2001-06-22 21:11:09 3864.8460
ORBIT=32304-FRAME=0495 2001-06-24 20:06:23 4329.6780
ORBIT=32323-FRAME=2871 2001-06-26 04:30:56 3604.6440
ORBIT=32323-FRAME=3006 2001-06-26 04:32:49 2678.4500
ORBIT=32332-FRAME=6795 2001-06-26 20:31:06 -928.1490
ORBIT=32332-FRAME=6795 2001-06-26 20:31:06 -928.1490
ORBIT=32376-FRAME=1287 2001-06-29 21:00:25 -7234.8730
ORBIT=32390-FRAME=1377 2001-06-30 20:30:04 -6647.8070

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Minimize ERS-2 Zero-Gyro Mode (from 06/2001)

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Doppler frequency for cycle XX

These plots show the Doppler Centroid frequency values for ERS-2 SAR data acquired during this cycle, separately for ascending and for descending passes. The estimated accuracy of these values is around +/-500 Hz. These plots are intended to provide a geographical overview of the Doppler Centroid frequency values for data acquired during the cycle. For a detailed knowledge of the Doppler Centroid frequency for data acquired over a specific orbit and frame, please goto the interactive Doppler query page or download and consult the Doppler ASCII file for this cycle.

ascending passes

descending passes

 

Doppler frequency difference cycle XX & cycle XY

These plots show the estimated absolute Doppler Centroid difference between data acquired in this cycle and in the previous one over the same track and frame. The range of ABS Doppler frequency differences shown here is limited to the range 0-1000 Hz in order to highlight suitable InSAR pairs. Values outside this range appear in red. It should be recalled that the accuracy of the Doppler frequency values used to compute this difference is roughly +/-500 Hz. For a detailed knowledge of the Doppler Centroid frequency difference between a set of products, please download the corresponding Doppler ASCII files.

ascending passes

descending passes

 

Doppler frequency values per orbit and frame

The file below provides the estimated Doppler Centroid frequency values for all the orbits and standard frames during this cycle. The accuracy of these values is around +/-500 Hz.The file contains the following parameters, in the order given below: Cycle number, ASC/DESC, Orbit number, UTC time, Frame number, Track number, Centre Latitude, Centre Longitude, Doppler Centroid frequency.

Download ASCII file (less then 6Mb)

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